Wiseco leads the performance aftermarket by producing the highest quality forged pistons in the U.S.A. Wiseco is unique because they forge all of their own pistons in-house, and produce all of their own forge tooling in the U.S.A. This allows Wiseco to control all aspects of their manufacturing process from raw bar to skirt coating on the finished parts.

Much stronger than stock. Forged using the highest quality materials available resulting in a piston that provides excellent performance and durability.

More hours with peak performance between piston changes. The rings, wrist pin, and circlips are manufactured by Wiseco under their strict quality standards to make sure every piston kit fits correctly, ensuring top performance and long-lasting durability are achieved.

Note: Oversize piston requires cylinder sleeving and top end bearing not included in kit.

Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, and will stand up to the abuse that high performance motorsport applications require. Most castings are brittle, have no grain structure and tend to fail catastrophically when the material yield strength is exceeded. Forgings have condensed grain that is aligned to the features of the part, which produces higher mechanical properties, and resistance to impact and fatigue. Each forging is designed to optimize the strength-to-weight ratio, and maximize performance.

Note: Image is for reference ONLY, actual contents will vary based on fitment.

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68 Reviews

4.9 out of 5 stars

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They guys at Motorsport provided the best customer service in the world. I will always going to shop from their website. This kind of customer service is what we need in America. The owner of this company is very smart how he/she runs this business. Keep up a good job guys.

Now let me move on to the piston. I love the quality of the product. It looks really well built but I have not taken my bike for a ride yet. It is too hot here in California, where we can ride. In 2 months or so then I can tell if it holds up to it name.

the whole top end only took a few hours and was up and running. Thing sounds great and the powerband is awesome!! I haven't had it in for long so the durability has yet to be determined but so far so good.

installed this on my 2001 cr125 and it has a ton more power. easy to install. just make sure to let the bike warm up. or idle around before you go ripping!

Snowman294Verified Purchaser

1 year 5 months agoArkansas, USA

Ease of Installation 4/5
Performance 5/5
Power 5/5
Style 5/5

Just what you expect from Wiseco

Just installed the Wiseco standard bore piston kit in my 2004 RM125. It was fairly easy to install, and the quality of the product is evident as soon as you take it out of the box. My bike is back to its old snappy, revy self again! Thanks Wiseco, and thanks MotoSport!

I just installed this piston in my 04 CR250. It is alive and fast as ever. Everything went together well and was easy to install. The only complaint is you get a little piston slap every once and a while, but that is it. The bike is fast and runs great. As always customer service at motosport.com is awesome.

blu119Verified Purchaser

1 year 11 months agoMesa, AZ, USA

Ease of Installation 5/5
Performance 5/5
Power 5/5
Style 5/5

Awesome shipping time, Awesome performace I have used wiseco many times and i've never been dissapointed....Motosport is by far the best online store to use

long lasting piston never had a problem running them ive had 3 every one has been fine strongest piston you can buy just let your bike warm up properly or you may have troubles because this piston expands with heat. all in all wiseco is all ill ever trust with my race bike (below) !

A: If you are just replacing the piston, then you need to first know the bore of the cylinder. This can be done by using a bore gauge to find the diameter or by reading the owner’s manual to find the bore specifications. Ultimately, the bore should be measured for the best possible results. After the diameter is known, then you can pick which size piston will work best in your cylinder.

A: The following is a list of pistons offered by Wiseco for your 1989 Honda TRX250R. Please contact one of our sales professionals to inquire about special orders and availability.Dirt Bike / ATV: 1-888-676-8853

562M06600 66.00mm STDDisplacement:246ccStroke:72.00mm

562M06625 66.25mm 0.25Displacement:247ccStroke:72.00mm

562M06650 66.50mm 0.50Displacement:248ccStroke:72.00mm

562M06675 66.75mm 0.75Displacement:249ccStroke:72.00mm

562M06700 67.00mm 1.00Displacement:250ccStroke:72.00mm

562M06725 67.25mm 1.25Displacement:251ccStroke:72.00mm

562M06750 67.50mm 1.50Displacement:252ccStroke:72.00mm

562M06800 68.00mm 2.00Displacement:254ccStroke:72.00mm

Tyler

Q: Just got this for my stock cr85, do i need to drill lubrication holes like it says or is it ready to be put in as is?

A: If the cylinder has an exhaust port bridge going across the center of port, then yes you will need the holes. If it just has a full size hole for the exhaust port with no bridge in between, then you do not need to drill holes.

Tyler

Location: Pennsylvania

Q: What size piston do I need?

1 year 1 month ago

I have a piston that is 66.94mm I am not sure what oversize piston I should order.

A: The Wiseco Pro-Lite Piston includes: piston, ring(s), wrist pin, and circlips. The kit would not include the wrist pin bearing which can be found here: http://www.motosport.com/wiseco-needle-bearing

VetMxer69

Over 10 months agoLocation: Fredericksburg, VA, USA

A: You should order a new wrist pin bearing any time you change the piston.

Chandler

Q: OEM size?

1 year 7 months ago

Will it send the OEM size piston for my 1998 kx125? It says that this piston is 77mm. It would send the correct size right?

A: Yes. Just be sure to correctly select the Year/Make/Model of your bike and "Stock Bore" in the drop down before ordering so we can be sure to send you the correct piston for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.

A: Yes this Wiseco Pro-Lite 2-Stroke Piston will fit your 1997 CR125 and comes in oversized. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct kit for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.

Zach

Q: Hi I have a 1991 kdx 200 and I'm wondering how much compression it's so post to have does it kick hard like a 250 or kick easy like a 125 please re?

A: Yes, it will fit a stock bore 1997 Honda CR125. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct kit for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.